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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0dec09af0185f07885c21495620a0e0226fab6392c2d7befcdee5e813bd4fba0' 
  AND token = 'GllIugHVqUd6hAHAfForDOeFbzUT51eBDQmgOc4McBw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}